MASTER CLOSEBOOK EXAM #9

1. The current will lead the voltage when ______.

• (a) inductive reactance exceeds the capacitive reactance in the circuit

• (b) reactance exceeds the resistance in the circuit

• (c) resistance exceeds reactance in the circuit

• (d) capacitive reactance exceeds the inductive reactance in the circuit

2. The difference between a thread on a bolt and a thread on a conduit is _______.

• (a) the conduit thread is deeper

• (b) the conduit thread is tapered

• (c) no lubrication required in the threading conduit

• (d) the conduit threads is always has the same pitch for any diameter

 3. Open conductors run individually as service drops shall be______.

I. insulated      II. bare      III. covered

• (a) I only     

• (b) II only     

• (c) III only    

• (d) either I or II

4. A _____ is a function that is similar to a rectifier.

• (a) commutator     

• (b) transformer      

• (c) contactor      

• (d) inverter

5. The term pothead as used in the electrical thread means _____.

• (a) current-limiting fuse                                  

• (b) cable terminal

• (c) protective device                                       

• d) insulator in a line pole

6. If an AC sine wave reaches a peak voltage of 100, what is the effective root-mean square voltage?

• (a) 57.7 volts      

• (b) 141.4 volts      

• (c) 86.6 volts     

• (d) 70.7 volts

7. What is the total wattage of this circuit?

240v                                            60 Ω            80 Ω

    

•   (a) 3.5

• (b) 420    

• (c) 16,800    

• (d) 1680

8. When measuring to determine the size of a stranded conductor, you would place the wire gauge cover _____.

• (a) one stranded of the conductor             

• (b) the insulation

• (c) all of the strands                                                         

• (d) the outer covering

9. The resistance of the filament in a light bulb is ______.

• (a) usually the same at all times                                    

• (b) highest when the bulb is off

• (c) lowest when the bulb is on                                       

• (d) highest when the bulb is on

10. When one electrical circuit controls another electrical circuit through a relay the circuit is a _____ circuit.

• (a) remote-control      

• (c) primary      

• (d) secondary